Add support for native extension notifications

chrome/browser/ui/cocoa/notifications/notification_builder_mac_unittest.mm

Index: chrome/browser/ui/cocoa/notifications/notification_builder_mac_unittest.mm
diff --git a/chrome/browser/ui/cocoa/notifications/notification_builder_mac_unittest.mm b/chrome/browser/ui/cocoa/notifications/notification_builder_mac_unittest.mm
index ee12b3dc48902be8ef25422886ad2979cf28434a..3bfb753eb21edce83f2244516b2cf00721093ea5 100644
--- a/chrome/browser/ui/cocoa/notifications/notification_builder_mac_unittest.mm
+++ b/chrome/browser/ui/cocoa/notifications/notification_builder_mac_unittest.mm
@@ -115,6 +115,53 @@ TEST(NotificationBuilderMacTest, TestNotificationTwoButtons) {
   EXPECT_EQ("Settings", base::SysNSStringToUTF8([buttons objectAtIndex:2]));
 }
 
+TEST(NotificationBuilderMacTest, TestNotificationExtensionNoButtons) {
+  base::scoped_nsobject<NotificationBuilder> builder(
+      [[NotificationBuilder alloc] initWithCloseLabel:@"Close"
+                                         optionsLabel:@"Options"
+                                        settingsLabel:@"Settings"]);
+  [builder setTitle:@"Title"];
+  [builder setSubTitle:@"https://www.miguel.com"];
+  [builder setContextMessage:@"SubTitle"];
+  [builder setNotificationId:@"notificationId"];
+  [builder setProfileId:@"profileId"];
+  [builder setIncognito:false];
+  [builder
+      setNotificationType:[NSNumber
+                              numberWithInt:NotificationCommon::EXTENSION]];
+
+  NSUserNotification* notification = [builder buildUserNotification];
+
+  EXPECT_FALSE(notification.hasActionButton);
+  EXPECT_EQ("Close", base::SysNSStringToUTF8([notification otherButtonTitle]));
+}
+
+TEST(NotificationBuilderMacTest, TestNotificationExtensionButtons) {
+  base::scoped_nsobject<NotificationBuilder> builder(
+      [[NotificationBuilder alloc] initWithCloseLabel:@"Close"
+                                         optionsLabel:@"Options"
+                                        settingsLabel:@"Settings"]);
+  [builder setTitle:@"Title"];
+  [builder setSubTitle:@"https://www.miguel.com"];
+  [builder setContextMessage:@"SubTitle"];
+  [builder setButtons:@"Button1" secondaryButton:@"Button2"];
+  [builder setNotificationId:@"notificationId"];
+  [builder setProfileId:@"profileId"];
+  [builder setIncognito:false];
+  [builder
+      setNotificationType:[NSNumber
+                              numberWithInt:NotificationCommon::EXTENSION]];
+
+  NSUserNotification* notification = [builder buildUserNotification];
+
+  NSArray* buttons = [notification valueForKey:@"_alternateActionButtonTitles"];
+
+  // No settings button
+  ASSERT_EQ(2u, buttons.count);
+  EXPECT_EQ("Button1", base::SysNSStringToUTF8([buttons objectAtIndex:0]));
+  EXPECT_EQ("Button2", base::SysNSStringToUTF8([buttons objectAtIndex:1]));
+}
+
 TEST(NotificationBuilderMacTest, TestUserInfo) {
   base::scoped_nsobject<NotificationBuilder> builder(
       [[NotificationBuilder alloc] initWithCloseLabel:@"Close"